|Definition - The inability to understand written or printed words when seen, owing to a disease of the visual word-centre.|
Etymology - The term was coined by the clinician Adolph Kussmaul to label what was eventually called dyslexia, a condition that he was the first person to describe in 1877.
Oxford English Dictionary - Its first citation is from 1881:
"This particular variety of amnesic aphasia has been named ‘*word-blindness’ by Kussmaul."
(J. Ross in Lancet 26 Nov. 905/1)